Molding-machine.



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. PATENTED JUNE 9, 1903.

, J. W. PRIDMORE.

HOLDING MACHINE.'

APPLIUATION FILED SEPT. 25. 1902.

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No. 730,398. PATENTBD JUNE 9, 1903.

J. w. PRIDMQRE. MOLDING MACHINE.-

APPLATIOH FILED SEPT. 25, 1902.

2 SHEETS-SHEET 2.

` O'NiTED STATESA atented une' 9, 1903.

PATENT OFFICE.

JOHN W. PRIDMORE, OF CHICAGO, ILLINOIS, ASSIGNOR TO INTERNATIONAL HARVESTER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

MACHINE.

SPECIFICATION forming part of Letters Patent1No7SO,398, dated J une 9, 1903.

Y Application iiled September 25, 1902. Serial No, 124.788. (No model.)

To all whom, t may concern:

Be it known that I, JOHN W. PRIDMORE, a citizen et' the United States, residing at Chi-- cago, in the county of Cook and State of Ilii- 5 nois, have invented certain new and useful Improvements in Molding-lvlachines; and I do hereby declare the following to he a full, clear, and exact description ot the invention, such as will enable others skilled in the art to ro which it appertains to make and use the same.

My invention relates to molding-machines, and pertains more particularly to machines of the rock-over type for forming sand molds for casting metals, and has for its object. to

provide a machine of this type having asupporting-frame of such a character that it can be modiiied or changed in part to accommodate molds of dierent sizes or contours and to provide a plate designed to support the;

zo mold during the operation of withdrawing the pattern therefrom so connected with the frame that its surface transversely and longitudinally will be maintained in a definite relation with the axis on which the patternplate is rocked and so, also, that the surface of the pattern-plate transversely and longitudinally shail have the same definite relation to its own axis, so that when the ila-sk carrying the mold with the pattern in it is 3o clamped down on the patternplate and the:

plate is rocked over onto the supporting-- plate the surfaces of said two plates will have the same relation to the axis that they had beforethe pattern-plate was rocked over, the

object of this arrangement being to prevent the pattern from injuring or destroying the mold when the pattern-plate is rocked back again to withdraw the pattern.

My invention is illustrated in the accom- 4o panying drawings, in which- Figure lis a partial sectional view showing the pattern in position'in the mold. Fig. 2 is a view of the same parts, showing the pattern and mold inverted upon the secondary frame in position to have the pattern,withdrawn.

Fig. 3 shows a machine with .the pattern-- frame returned to itsinitial position, the flask and holding-clamp being shown in dotted lines. Fig. 4 is a plan view of the parts 5o shown in Fig. 3.

In molding-machines of the rock-over type the pattern is withdrawn from the mold,

which has been inverted and placed upon ak su pport and which must he substantially parallel with the axis `of the frame upon which the pattern is mounted. Where the patterns are very deep, it is important that the mold he placed upon a surface which has the same relation to the axis of the frame that the pattern-plate has to the same axis in order that the pattern may be readily withdrawn Without destroying or damaging the mold.

Referring to the drawings, A indicates a pattern-plate fitted with a pattern A', which plate is provided with ears or arms A3, which are connected to a pivot-pin O iu order to permit the plate to he rocked about the pivotpin O as an axis, as is common in machines of this type. The pattern-plate is provided with the usual pins A7, which are adapted to engage perforated lugs on a flask C in order to hold said fiask properly in position on the plate. 1 It is obvious, of course, that the steady-pins A7 may he located upon the Hask land the pattern-plateA provided with corresponding holes. 'lhe pattern-plate is provided at its forward end with handles A2, adapted to be grasped b v the workman in the operation of reversing the'plate.

Projecting at right angles from the bearings hy which the pattern-plate is mounted upon the pivot-pin Oare two brackets A4, to which are connected coil-springs A5, which are anchored at their opposite ends to IugsA6 upon the machine-frame. The purpose of said springs is to facilitate the initial move-l ment of the pattern-plate in both directions about the pivot-pin O.l

Journaied upon the pivot-pin O by means of projecting ears or arms E2 is a secondary plate E, which is adapted to receive the iiask when the pattern-frame carrying the same is reversed. -Li-kewiseupivoted tothepin O is a suitably-bent clampingbar`D, which is adapted to extend over the top of Ythe iiask and securelyclamp the same upon kthe pattern-plate, while the portions of the bifurcated handle D' rest upon the corresponding sections of the handle A2 of the pattern-plate, as clearly indicated in Fig. l.

The mechanism as above described is mounted upon a machine-frame comprising standards or legs B B and a single longitudinal bar B2, preferably of Wrought metal and shaped to accommodate the particular conditions of the work. Centrally disposed upon the bar B2 is the bracket B3, which is provided with laterally-projecting hubs, which constitute the bearings for the pivot-pin O, While a bracket B5, disposed upon the forward part of the machine, affords a support for the pattern-plate when the latter is in its initial position.

Machines of this general type have heretofore been provided with a supporting-frame formed of a single casting, and consequently when molds of different sizes or contours are to be mounted it is necessary to provide a new framework for each style or size of mold. In the machine as above described it is to be noted that the supporting-frame is so constructed that the longitudinal bar B2 may be removed and another bar substituted therefor, the latter having the particular formviz., length and contour-required to accommodate the mold to be mounted.

In operating the machine the pattern-plate is disposed in the position illustrated in Fig. l, after which the flask is placed over the pattern with the ears registering with the pins on the pattern-plate. The laskisthen filled with green sand and properly tamped, the bottom plate placed in position, and the clamp D brought up over the bottom, after which the handles A2 and D' are grasped by the operator and the pattern-plate and flask reversedthat is, rotated upon the pivot-pin O-nntil the bottom ofthe flask rests upon the auxiliary plate E, in which position the pattern is in condition to be withdrawn from the mold. lt is essential in using deep patterns that the flask containing the mold be placed, when the pattern is to be Withdrawn, upon a surface which shall have transversely and longitudinally the same relation to the axis of the pattern-plate which the latter plate has to said axis in order that the pattern may be withdrawn Without injuring the mold. I have accomplished this result by attaching the plate E to the piv'ot-pin O and supporting its outer end on a part of the machineframe, so that said plate E is always maintained in the necessary relation to the axis of said pin O.

In order to adapt the machine to molds of different sizes and contours, the bar B2, pattern-plate A, and auxiliary plate E may be removed and another bar substituted for bar B2, the latter having the particular length, height, or contour necessary to accommodate the particular piece of work to be undertaken, after which the other parts are reassembled as before.

Having thus described my invention, what I claim, and desire to secure, is-

1. In a rock-over molding-machine, the combination of a supporting-frame having a transverse pivot-pin, a pattern-plate pivoted on said pin, and a second plate for supporting the mold during the Withdrawal of the pattern, also pivoted to said pin, whereby the necessary position of the second plate is maintained relative to the axis of said pivot-pin.

2. In a rock-over molding-machine, the combination of a supporting-frame having a transverse pivot-pin, a pattern-plate pivoted on said pin, a clamp pivoted to said pin and adapted to hold the flask on the pattern-plate, and a second plate also pivoted to said pin and supported at its other end by the machine-frame, whereby said second plate is maintained in the necessary position relative to the axis of the pivot-pin to facilitate the withdrawal of the pattern.

3. In a rock-over molding-machine, the combination of a supporting-frame, a patternplate pivoted to said frame, a second plate also pivoted to said frame at the same axis of rotation, whereby said second plate is maintained in the necessary relation to the axis of rotation of the pattern-plate during the withdrawal of the pattern.

4. In a rock-over molding-machine, a supporting-frame therefor comprising standards and a longitudinal bar'removably secured to said standards, whereby said bar may be replaced by another bar and the frame adapted to molds of various sizes and contours.

5. In a rock-over'molding-machine, a stipporting-frame comprising standards or legs, a longitudinal bar removably secured to said standards, and a bracket provided With journal-bearings attached to said bar.

In testimony whereof I aftix my signature in presence of two witnesses.

JOHN WV. PRIDMORE.

WVitnesses:

CHAs. N. CHAMBERS, WM. WEBBER.

IOC 

